How to bind two columns in datagrid in wpf

How to bind two columns in datagrid in wpf.
I have two combo box columns in my datagrid. I want to make those column bind to each other so that if I select values in one of the columns it will bring respective value in other column.
Thank you.

WPF Datagrid Combobox binding to each other within the datagrid
http://stackoverflow.com/questions/2990910/wpf-datagrid-combobox-binding-to-each-other-within-the-datagrid
="{Binding ElementName=anotherCombo,

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